低浓度毒物对海洋微藻生长刺激效应的初步研究

1　引　　言毒物刺激效应又称毒物兴奋效应 ,是指毒物在较低的浓度下 ,对生物非但无害而且表现出刺激生长的现象 .Ｓｔｅｂ ｂｉｎｇ10 ] 称这种现象为毒物刺激效应 (ｈｏｒｍｅｓｉｓ) .目前已有许多报道表明 ,低浓度的污染物或毒物普遍对海洋微藻的生长具有刺激效应 ,并被推测是导致赤潮产生的重要环节5,7,13 ] .另外 ,已有文章报道 ,海洋微藻的生长繁殖与藻液中的微生物密切相关 .因此 ,推测低浓度毒物对海洋微藻的生长刺激效应与海洋微藻生活环境中的微生物也有着一定的关系 .但是 ,关于这方面的研究还未见报道 .在少有的有关毒物刺激…

Preliminary study on the growth stimulation of marine microalgae stimulated by low level of toxicant

Cell growth of Nitzschia closterium and Platymonas subcordiformis was stimulated under 4 and 8 micrograms.L-1 anthrancene stress, respectively. The cell growth of two species was also stimulated under 30 mg.L-1 streptomycin stress. The hormesis of marine microalgae cells under low level of anthrancene and streptomycin resulted in low level of free radical and decrease of microorganisms. Furthermore, the hormesis of marine microalgae was also discussed in this paper.